<template>
  <view :class="[styleType === 'text'?'segmented-control--text' : 'segmented-control--button' ]" :style="{ borderColor: styleType === 'text' ? '' : activeColor }" class="segmented-control">
    <view v-for="(item, index) in values" :class="[ styleType === 'text'?'segmented-control__item--text': 'segmented-control__item--button' , index === currentIndex&&styleType === 'button'?'segmented-control__item--button--active': '' , index === 0&&styleType === 'button'?'segmented-control__item--button--first': '',index === values.length - 1&&styleType === 'button'?'segmented-control__item--button--last': '' ]" :key="index" :style="{
        backgroundColor: index === currentIndex && styleType === 'button' ? activeColor : '',borderColor: index === currentIndex&&styleType === 'text'||styleType === 'button'?activeColor:'transparent'
      }" class="segmented-control__item" @click="_onClick(index)">
      <text :style="{color:
          index === currentIndex
            ? styleType === 'text'
              ? activeColor
              : '#fff'
            : styleType === 'text'
              ? '#000'
              : activeColor}" class="segmented-control__text">{{ item }}</text>
    </view>
  </view>
</template>

<script>
/**
   * SegmentedControl 分段器
   * @description 用作不同视图的显示
   * @tutorial https://ext.dcloud.net.cn/plugin?id=54
   * @property {Number} current 当前选中的tab索引值，从0计数
   * @property {String} styleType = [button|text] 分段器样式类型
   *   @value button 按钮类型
   *   @value text 文字类型
   * @property {String} activeColor 选中的标签背景色与边框颜色
   * @property {Array} values 选项数组
   * @event {Function} clickItem 组件触发点击事件时触发，e={currentIndex}
   */

export default {
  name: 'UniSegmentedControl',
  props: {
    current: {
      type: Number,
      default: 0
    },
    values: {
      type: Array,
      default () {
        return []
      }
    },
    activeColor: {
      type: String,
      default: '#007aff'
    },
    styleType: {
      type: String,
      default: 'button'
    }
  },
  data () {
    return {
      currentIndex: 0
    }
  },
  watch: {
    current (val) {
      if (val !== this.currentIndex) {
        this.currentIndex = val
      }
    }
  },
  created () {
    this.currentIndex = this.current
  },
  methods: {
    _onClick (index) {
      if (this.currentIndex !== index) {
        this.currentIndex = index
        this.$emit('clickItem', {
          currentIndex: index
        })
      }
    }
  }
}
</script>

<style scoped>
  .segmented-control {
    /* #ifndef APP-NVUE */
    display: flex;
    box-sizing: border-box;
    /* #endif */
    flex-direction: row;
    height: 36px;
    overflow: hidden;
  }

  .segmented-control__item {
    /* #ifndef APP-NVUE */
    display: inline-flex;
    box-sizing: border-box;
    /* #endif */
    position: relative;
    flex: 1;
    justify-content: center;
    align-items: center;
  }

  .segmented-control__item--button {
    border-style: solid;
    border-top-width: 1px;
    border-bottom-width: 1px;
    border-right-width: 1px;
    border-left-width: 0;
  }

  .segmented-control__item--button--first {
    border-left-width: 1px;
    border-top-left-radius: 5px;
    border-bottom-left-radius: 5px;
  }

  .segmented-control__item--button--last {
    border-top-right-radius: 5px;
    border-bottom-right-radius: 5px;
  }

  .segmented-control__item--text {
    border-bottom-style: solid;
    border-bottom-width: 3px;
  }

  .segmented-control__text {
    font-size: 16px;
    line-height: 20px;
    text-align: center;
  }
</style>
